Not everyone is refused .. some people got approval for TRV... majority cases are refused but not allThat's great! i read that if you've applied for PR, they wont' approve visitor's visa as it contradicts with the intent of TRV. it's great your spouse was able to get it. I might apply and see if my spouse will be approved.
My husband was refused twice. He submitted proof of enough funds with proofs of his secure employment ... he also holds a valid USA visa .. still refused . Your spouse can try, it won't have any negative impact on the PR appliation